The basic user interface of AMG4PBLAS consists of eight methods. The six methods init, set, build, hierarchy_build, smoothers_build and apply encapsulate all the functionalities for the setup and the application of any multilevel and one-level preconditioner implemented in the package. The method free deallocates the preconditioner data structure, while descr prints a description of the preconditioner setup by the user. For backward compatibility, methods are also accessible as stand-alone subroutines.
For each method, the same user interface is overloaded with respect to the real/complex and single/double precision data; arguments with appropriate data types must be passed to the method, i.e.,
A description of each method is given in the remainder of this section.